Name the following :

(i) The category of vitamin required for clotting of blood.

(ii) Any two diseases related with blood clotting.

(iii) The antibodies present in the plasma of O type blood group.

(iv) The animal for which Rh stands in the context of blood group.

Fill in the blanks :

(i) Ventricles have …………… walls when compared with those of auricles.

(ii) Ventricles give rise to two large blood vessels called …………… and ……………

Can you answer why the pulmonary artery shown in figure is blue in colour ?

Name the following :

(i) Contraction phase of heart.

(ii) The structure that holds the heart valves in position.